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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a08742b2500e8e400c3404863a6de4266d7f2f581e07df00a9c2239d71f779e6' 
  AND token = 'vK/FnRr6gn5P5TXCNdUrJYBTfGifT10EzeoIJ2z8xB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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