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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34ee1282fcce565430fe01fb2636303d76c9561febc7a77210a0a77c8700d414' 
  AND token = 'QHkt1WCyTkhquTy7ax1cqE2BGcIbBXOBcAp7bmCDVLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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