SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f10086a2533c2585eb635a585e2175d77465dfb0b086790ab1baec388f9cbc2' 
  AND token = '9T+YJ8IzjZhFwHYLmu53rr1ES5+a/zA1ufZmr4uRiZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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