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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d790fa95a6ae2d9ae162be3499540544f92ee20eee301145771d56e62eb147a' 
  AND token = 'wfA/3bCuYT+kGR3B/NPGDYeLqcPXS1JbW00FhKveD5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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