SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72f1d2add119d584a242de911cf0ec34c024fd6b681ec8d023a31a407769d84' 
  AND token = 'od0On/cry7uae6Nel/XyG1PhzB0/23uN5cKK+CGkqbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00112

JSON explain

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