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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69eb3ed1bbdbc2b8ec58a98ce80b64933b9e6b8c067b6670c7e435e637aa12e9' 
  AND token = 'k34rx460AAQoEwVwwEHLDHs7yf1NyWRCHqBKZpCmsac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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