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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c85b82da6cf71b058959e3f58f055920f6d96f8a3d9ae8acc1dea3785e58dea' 
  AND token = 't2poHWVN4y5WmDA7uRR0FXPOLcGDy/VkWVgwu+a3wqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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