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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34fb038e09d8ab679dfb2b5dc7a244fd0d6993da283c9b7316bcd2c7e1ffa16f' 
  AND token = 'gku7N3ft6FrJh1EUawIF+6Z3xyCMfGY3uhBZ1PwNIjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00126

JSON explain

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