SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1580ac694e0441fefe94220a7b3bd9378ab8a5d019ca396a30b1c4e3e69964d9' 
  AND token = 'X7/utqhlWggelqIXKnqJNz8Fy8MtWKKYU2BGYXFe/Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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