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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13d68c6aedb2359070a67bbd21b6d4db4d98456135b4ab4d44a3905d96543a4c' 
  AND token = 'KO8ja7KhlpHOStp4+bMSZTjcYxFEAJVttF1OE8xpBQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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