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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1654718360e3eaf2a02ffa6e3198ec4dd85fd6ccf4f10d08b915b41dff12faa0' 
  AND token = '1W8gCQWWkFHKCnn4N4zHFXPpk62lsnaA0lhCdDjRiSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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