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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4adc20ebdf9827b923ba9139a557c4c70d459001177d295512e3ae75f178d4b' 
  AND token = 'XeyONW7kVIoi6kzAbfHQwWVqQD5+l1/A2TDNueGPk3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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