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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fc18f44d98b82cb4fa2e9c58c9b9ead3ed81eb7a0633d057e97ae7ab3f7416' 
  AND token = 'KGwTeOWkC8093HIhs02yiOfr7UU/vFi0Ekd2y+lndkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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