Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b7c5f40de3f585737181cfbcd15616cf888fabccc366b25f1c17518dcc56c3f' 
  AND token = 'lVc+kMrAawqEFqkXw+Yo0UYtiekAyeRbBvd+NVsO5UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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