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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5b5194807c0d22ca24d9bc765fc01dab8954132d07aa065a89b295e680a654' 
  AND token = 'UhMQrf85QHLXHkHKQGjmzQgmzEo/PAe6Uf7mBc7umEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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