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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95062f2c3e5066bae0af021db07f478c5c10a9e7e999d6804c82ac9159d24b4e' 
  AND token = 'a6iZ9nCNG1VXLk/dkIYtqZgtVWb1BkJpJgxzcTmBk14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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