SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc41ee658df650c52b8ab80cf00ee2ca0ec4e1114cd99fb2abb100ecebf549b' 
  AND token = '8eNBNGBX2/rE4XawahZFqeGb5ZKGNBwGQzH64x6P+0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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