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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ac2a57314a61d2bacc1b277378dcfaa356db4a85b9571f63ee96e47db353b6' 
  AND token = 'RwNyvwbIMO8HX62Bs5tMK0A0e2dT0oG5ZaTIKGZH/K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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