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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd890d72ed290dff8b069e67d13c3a8c195b3c3b94fae4b326f96aada8e32e31' 
  AND token = 'VMoypFCzbC/kntCZJFW33gKGOiz+G9f130WbatbgXF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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