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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04863601155634e1ae776e469c4012512c05fdce74ea09c40b6665ca5590c71' 
  AND token = 'YhWTTAhQiIVaFi5+ZFB+m35PLGDyKNU5Y9yKTX7pF7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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