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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116c71f9df39baa7e1ff0a1d8dfcd9f38af89826b9f7858e6a3d7865dcb3a721' 
  AND token = '8iogJrm51Lwbe+HyzpwLN7lagtt26cpObc+40U6pA+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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