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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6511ee565b29ac99a444dd7418287f59c56e815872d5f1c6f05e2422bcbf4492' 
  AND token = '9ZLgji4T2sS0wZoLnM3ivrBC7wB4QsZ/tV67aEnIO+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}