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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36405d836d261edf12f6ed70042c4fe7694c0cf7bfb2e28d7a6bc322638c28bd' 
  AND token = 'l2SAbNMMDxXq67XQhMlyUpKEQXfAgVVSt4G+/mNLIZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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