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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4304b1e74fba55a7f683207d501478a84eebe0ea5570f6ecf0ad5274eb246966' 
  AND token = '8LYh8WF7wH7ibXX5bi3FDN7LRomG+qxsWBD47+WPcrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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