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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fce40738643d56013f9146e1f0780648f4b250944c26491b83b171dff1f6115' 
  AND token = 'Qvevxuv032JCcG1lJlxF1H3H1aqFZrcR+WtfRAOjMw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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