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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69bf514cfcd2830d6c5acd0efd9cb369270dc26f57d225adf01e92a2cf24d078' 
  AND token = 'WXKh7Ph7Mudyf6x9RYjX8e9a0vUk0brSJPeqh6NfFII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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