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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca04b0ea1fa34d9171e974632328ec2bb63a21a60b5c796397924f8238d6241' 
  AND token = 'AHbFeffgQ0FzujnOZMWRsBmE8N7M1eZfEsjG6i8WuKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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