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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95cc52dd6854ed3e1c17bf0f1803ecedc25c3d0c8ca79f4178ff18cb112384f' 
  AND token = 'E/4kNwzqNStZnbxM4IDxPEASzTKEXkllplFcaApm0cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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