SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd667b3600a2bcdbf28cc41794f8ed3eb74051a4bd9ff04c8bb090e4e9575e01a' 
  AND token = '+6eliwgmKigBCfXUrazmhLOpDGBDdD/ClcHrINZ7/1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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