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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd203578e19f0e60ec4522d82194d095b118c22c60d3cedab72fea542b0c80107' 
  AND token = 'wWF4SAvsn+MiwNiRCVca/HMs9Av4KPs9JUFBUml5Zvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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