SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0aec3c097384ba364210e679e7846cb0ea9ad6799d5a65ed87885d3f33e4eba' 
  AND token = 'l5D4nXjmKKG6wU25bOJrSJZh11WNPQPVJgKB9K5wOCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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