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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725204865f0f76f054c3d22bb2bf8ba1f9b82d395be9ce9ff00d779c8eedd976' 
  AND token = 'x1I+Z0ofef9wWVGumxmNlVu1OsooxW/30LmQm8zYsmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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