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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc34b71e7759c6e47546da4aa2d8505a7230d462e70312c6993d300d67666303' 
  AND token = '53xcR7xDEEen1vQJ6MQGDkREOizwI8Byha63gU6ZawU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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