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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54620ddfe9db3baf3f5951ee2ee92150fe913c69a577bdc3aa3848aed6ec58d1' 
  AND token = '32SCFLDzNhDZMN+94V2v2ZOnw/tCQGGRlOWQL7/MTfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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