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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df9031991477bd55c29d9989542e2c0f8d3fa25a2c3fc2ee5c6e1509a67cc5c8' 
  AND token = 'awmoUCKcyQvVr0c41im32XQfAmCFJMbTqUVLjlF8Sys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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