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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '551d97ca5b49ff691d45f177b3854e2bc97456b93b3c215b8bfb0331f64589d8' 
  AND token = 'NCO8A9OaSvLxeY5uMGgiwbMjzRUrYqbldzLCIl4Dv7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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