SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba15ce38ed10f14d7b21a5349b5c89a5db0ef4d4a44845f6f2d08e3aa47b8b7' 
  AND token = '/ZCl7O6YRbXi+R3qGQsMzDVymcaw5FM92hvfLFipBwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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