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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc527923654c6fe655848acddb8359812e602a725185642cfd41745f12562562' 
  AND token = 'HES5LzU9n7UTk8Jy/Pj9MOhGyUZaXuG57dLu1Yjv4AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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