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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '179dbf2ff6744a3ce0944bf2ee4b4de44bc57b5bab502454d8473effb31cb5b0' 
  AND token = 'IFzOPVY8wOGsta9UbFf6V2KF0wZJylqOHCEAyr4Eliw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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