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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3badba5ac25d6fd28bce9b06297050ee54372a4140f081e6f80665496d2ee8b9' 
  AND token = '/4KgG0aQhGZStB59ui28oSK8YQSfYh9Q/vgwcFD8OIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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