SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0424d2d94c679e2f63f159b31a416933bc3bf6b04c0808ba66f8ac540c97b132' 
  AND token = 'HS/PBbXUwBsopu+QmpKJIeTeqq+DTuCW7U3kE+SGUDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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