SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06bacde73b9d822487981fbcac55c7d0757797789b6c0e447f1dd931dc93948c' 
  AND token = 'ryAK+v7Ej07b/umwm8x3Mc9lIBg5RIRXBfs4qYJ2JGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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