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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca9900fd7e8b846c79159781fa467d25b3a130aac771c2549591de5784ad7a6' 
  AND token = 'l04QQ7a35tnXCBxZRKK8gI22DbPJpOWHipGHb7Tnw/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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