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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2e18e2247afc83d361b5cb55900b25256528a5d02ebb8aaa11143992f4de57' 
  AND token = 'gAZwe9t1aJxkGMgXf9b+XmT9yJzTa9sIn6NGpg6baOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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