SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095dade2c5459b393208f68d154f6b2a5ad77711b56fab7fd672999c80f69c72' 
  AND token = 'lp7Acw9DgQzCPBqA9fhz9XaVWz3/Tdc/rj9H1AJRaAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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