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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d5a3c79f6d1288ae5e3cb3f1973d1e6307da3c9dea5769aa466dfc6ffd91860' 
  AND token = 'v62WLcQL0xJ5KrtsZAcIsuxe2Zna4N1FOeqkLqZnydw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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