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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbe738626cfb0fc6025b49e1ead00677a640d791723a1897cd03b8f89a7cf8c' 
  AND token = '+NZJ7OzU/GV964vkY4q89upGO9B6o34dAgECuLAjaco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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