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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f926ea47e23d564a1d332e81959693c5ce09d90cb5e222ee4a3bb4cdb62614d2' 
  AND token = 'ywsKODsIZ3gwQwqv/gluRRMoLO8RH0Tt0PHifrwUMDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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