SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d742913969de8b68cbefc5e4f098d6203b8738b9e99a4e51f6914a1f412854' 
  AND token = 'COL+S9qzC+9pKKYvwhOgl1fm+svZEGGy0djxmpVCd8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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