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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ca8a3421f3598cfe40c926fd379fa6e068b6b6bebcab89375bbcea4110d775' 
  AND token = 'RrfI9jE61V8JlAiK3s8cUCVn20AI1WNjV74qbN8sBr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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