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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '742682b2f453664534f0f6ff8ae0dc7c14b8214e1d02f3d925061e7e13b731f9' 
  AND token = 'QCc5wjh7hxQaz3tHm8bU1jQ9ChKzCc3/5s38yJ0Irqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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