SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abbb8b4d0ac00410e1677de9cac7d37d270b7efcc13f1d02a58b99423c9454b' 
  AND token = 'Lsvw0vI7TCQVSHLmnmjeR5R18KA8pTwBBgJDCRO8B/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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