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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ccb7eef1f671564c289f2c146d53aeaa46c6d715b9cda337e3406ad5447b84' 
  AND token = 'Db+yTfdQSvxRsvMFjwSfjtm3oZyx3cjSchnCwKgo2oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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