SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d4f274b7a2285a8b721397e61cf83c8c7581e0dc24ff8eaeff760005a78909' 
  AND token = 'coZl3sksFdT+pIGMwY5Lj5X2v1uQBilt9bS5x+L6g/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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