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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9031a814b18ecdebf5641d852047203350387091a69f9ed8a776f3cee213d6e1' 
  AND token = 'Aayt+BwETmGl3UK24ygLPjWQpeGgoXakWq50VwG92d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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