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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89fc3a32d1bbda885a9f8b9daf0f71a206f4456f40f409ba0666a530d0186adf' 
  AND token = '86rPIWI19J5Y7me0CU0XAofHtD8hI4NGYPMciXB3CMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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