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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee997d9a4b3fd48a0aa59b9e29926ede8a9719cf98e281bcc47555981282e36' 
  AND token = '169+hE9mDFbMK2JJitdE1peaySQ8gU4V9mPkjJw0nq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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