SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faadbc396843a776d25f1c32bfc0c45fa5cdd0ce39265149ba282d44a124d1d7' 
  AND token = 'tS+UnS69TADqrDYj3OCJmzv2H8RKg2ELtbXQXHyLG+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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