SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '419b6b2768cc95894ffe0f9f305a2e4672ce87fd40aab32133b3c8881c5a3bdc' 
  AND token = 'GY0ZDdkwihnK1vOaJRrQPLdTQ+5aIWGClO+crKuEdG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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