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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026afc2b24fb0119a9ffb723be4a9b3b04d0f5977c3480730f938138f401c8bb' 
  AND token = '/TiGThpF5ZHmpXZlzfFsUnx6nSGTUYMr/etNpxsCGmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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