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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42158a7913269320a7cdfa665814b48d3ecd9b200929b7a1a8cba934ec66ea0a' 
  AND token = 'Q+H9pAy834AXpWHuL8h4+qf8WlAM9ZHQhN8RoGqTl6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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