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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeac48ae64a840dad43d65d1da5ccb0f580f936feef2b09b53ddbfddc5251b9b' 
  AND token = '+eD5+72QoPAafvXepm343V9O9ltn3MpfVLBqzBs9ge4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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