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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d28d11ab04469552351bcb6e605e7c1f278e83014206ce10857ff7c1e8b7ae' 
  AND token = 'rpUln342pmTKXga1Z8qAfX6yGc32LbWBcLgHHqM/LGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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