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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef693275246d0daf1fd3057177054c39ad6f26e9f29112945a454e94db75f8d8' 
  AND token = '4ypq6J6VinvORr8JVu7K0aqFSHXo897Jj7jd3c1lSew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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