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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '405e93453376b3c44b0757ca93d93e66fe3473c31ece065af194fec5e3bcf607' 
  AND token = 'UE9gZGHQIytPx2E72Ps6eJ8FGwuwjsl4tBclPIT9lb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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