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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09044e73fcd4a3458edf6b885fc240bc7b6a172374465b27440e8fd05d31ac9b' 
  AND token = 'tKqXo8dWM0LuuSML9HQdTz7o3Kfg50hbYihpqa1phPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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