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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b8fd05fb7184777973e1ce00c7bfd8f739bef0d9085ac08712d3d26311f3c3' 
  AND token = '2jc7/I0ONOLk34E19DnkMMN7KMrCFXIOKHPQmGGETLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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