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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23806dcfa25b39abbf0799aafea70169496a67451bbe644bbb9051db39070453' 
  AND token = 'oJmCrnHS7Y/u8N8ORixZDlQ6Has/igxs58Nks6dmzBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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