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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '684a88b85dc4e4f013e97344f97cbdd8246d0363ef8cb3f1d7d9693f906acb2f' 
  AND token = 'U7eCJqKZ/YaCU0HSt0OUi6tNAgirM11rftbBuVEO/b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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