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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15a302f384604500bfc173ac754bf3f29dd68dc121d31fff3cf926a30fb3e4c' 
  AND token = 'yLQNaGabqK9LreE2+lPjnlA9YHq5v/WlfyLMINEqXsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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