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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5f8e3eb0b0d4371eca137aa1daff153c884dda8f365bb96321daeacd4ece4d' 
  AND token = 'E/w4f8w9pSyAYt7tohDlRZmYjX5BooT+EeV6WMguau8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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