SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2038d2982878229b836f9f8ce1e29f1a1e31317470589a17e9ec4d4bcbbd25c3' 
  AND token = 'XvHBQWH/hN44Z9dfn2D/rAnry4pchM31r6m4UuGQLCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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