SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74d2b39b6d58d9388429423ef7418a8f96223a2e11293258b45ab34f03aa9787' 
  AND token = 'xXhs5qlaowv8wQJjeVrxnG1FHkDJZcx/pGPsTSEIcbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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