SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8799dcd1cac85002a9266d3357a880245dde112f53b445c48e60dd25e7e3980a' 
  AND token = 'BADJuneiFHUPIGOLjrdwVIlglu5+fn9Yl0YL3MqDl+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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