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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73bb05ec8deadd5f00bce8ec1ac229469dca96a9e8bed6ed7613521d97a8201d' 
  AND token = 'yESt07kLkasYvhVk8NjEG6SeGI3nS8tkqEmZGpO2juo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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