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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d7596b849a56d76f53000d9fb24757c85db9454f7a2ed6fab2a3cc795ed0940' 
  AND token = 'qt+bgmcWxqPOLlb89IaPASs2W4cQrWfL+npHYd1Jqzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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