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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35a7432f67034535e67895e29a7d7e767e103c51e34f8d679806b281be5d7f9b' 
  AND token = 'F6qC7CIBDfg/iHpl7jgxsAevu6l7fgS+LWXmojibiLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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