SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e930b9bd0acc6fcdcb7a3e661fd4482792dc9874181075f8fbbfc609911a18c2' 
  AND token = 'xhZnRB+qmwvEw29NUPIF/t/OmgaU96tNQCYS1oER4xY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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