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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c48e49a0ee2e290fd79e0ad961d6731248726b49651a5ec801ebc6037336ed' 
  AND token = '+fQXb/RjyNqq/EhvEo4TBdWxYXGQ7A4wXhSvqEi0R7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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