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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ae64f870dd2a9fd872ec148cd7700bb9e752293a050dde6f2abd08bf44305c' 
  AND token = '7A4DM9+Mffh0I8/mz+7omLy/ryoItZ8OgNyyHTxFMZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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