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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35bcd807f553069f5d6ac79d41e1fe31181debf89455f9a90fcd1b64ebd49fa4' 
  AND token = '2DCuekXqWU3DL1HtNFsuVkNi3Hm5IHlGzJgbETu8ue0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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