SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96bb5899e7f9ec8e4b3937651d55bc6ada74420ce564fee5e73632dbaa8037bb' 
  AND token = 'vHGmhJSKcdjk1SGILtYFZmsXx3dAGnBnU3EHzjfcpWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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