SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '696a4a305924349bbc3249cef53adcc79b57f1e2f4e23bbc6c176d61dc63cb8d' 
  AND token = 'YK7NKq+DbFyzic+lk7W6s0PtwNX/lvHTyqqQp8FUZss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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