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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad58f2364b9e2c605f301c076f0554f6c92b77b8c55e4c76e7f29267f9db60c' 
  AND token = 'SCrns/OOV/uoohUiU+B3XkxkbGKU4zOQ7AIOWYHWApE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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