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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52816acfe816b1f2d1bfa1c59af64bb28d8a8ecf8e9a2c279e7b4837686b3562' 
  AND token = 'TigHTbXeAPzQKarO4HxGpKiaSF4BXJyJFeiqC7G/P40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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