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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23761aeb5352d16eddfb87954312014519b665058786d07d0f85897f57bea7a' 
  AND token = '0ih1DFB4992Xr9hMeeB3jGGyEytYAggw5K5LihoJWQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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