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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98f139f4528069ccba4ec4c6ce56153ff870832371b8daff9f4fb90dbc07c58c' 
  AND token = 'xx/Y4FLoS4zi7OHoB9pUYVzTz6kvnGRzAI1Ao+kESrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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