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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f728054d5417d48eda3f57316530066b505f4b940dabca9e641793b7f2b6865a' 
  AND token = 'kTVF/AOUeoqI00Icyo0TivtCZ/SV4IjGIH1NE3jktTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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