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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3708f5365cbefebe4860d48ce60c5cc5085ce005d5b7ba48e2fbce634e7ef047' 
  AND token = 's34YDU6hBX9IAX41EdY8CT+494PHgpuXzDhj+mWjc64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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