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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee478a6d28ee0da36c680e0e65567cdaf79cd81b7ab9d12d182a704c74ddf99' 
  AND token = 'F2BnhXHoRYp35K4yTH2o11N5WLY3Gn3GaTucaOJbEkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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