SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3ab2225cd5d488a28b477619cc1fc03d54dc2043735c20098a125544b2a809' 
  AND token = 'OAj+Typlj/+SYFk0MXlfOQGbrCM+vVwoYJ4RrP3U2/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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