SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f48850f14eeba5faa7b3f7dd4c949e1f7b591d463667b3488bd20fc3d55d17e' 
  AND token = 'RXsx7p/VLDLPchyw3dehwemqjBLFUYHXZ3O8SRwWpJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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