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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469c090c938ce772d6d36e474ddcf17a345ee2d44d6df8406afa8958428ce418' 
  AND token = 'hmNTr5c72lQl/eY8zesza0cLhL5oWoMDT39XpAYz2p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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