SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf9fb5d82523da14e61a075e2f3d377060a44e76c623b8d50b9674a157523f6' 
  AND token = 'o/rpVXYKNyLqQz7B4SaVrGNJCeZtAmkxl3AOdjj6coU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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