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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6338d6eff1872044b49b4721ffca35c0a11339e814867d95d7e2b9ca40ebe90a' 
  AND token = 'i5Ctc/KmbqCgZV4HGusq1Cptz+7Xt0xa5XM/RCs5Xrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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