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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ebe3f6aea936a561947eda2b0079dfec32fd9a6a0dce474b42949d3ecd502b5' 
  AND token = 'QLGbAmxxTJGazusioskIyW++8WHk/I8Xa7zYBQ8FCzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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