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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69dd2d3bbf481e91792256f7f5d5eef4980ae82f5ddba7ad66ab426451ad407b' 
  AND token = '3Yj9oSi9z2n9ZeAFLMtWQt2miqO4WMFm102o/TyC08Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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