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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd75d07edf9a2711d9fcc94b34a1e9299128d54c140478b211bd142e2a42ce609' 
  AND token = 'np9T+f9likOl+Srghc5Rkto9NS6cU00s08/J4febd3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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