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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61cc33ebf7dcd77ca1df26567a33005b96f58a3f011ff0aef924df75de30fe7' 
  AND token = 'tHMH6YLpRoZhSFTKazDhiq3WT5wsj1g5cqL0DA1O24s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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