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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f73ca002dc2705b757de3daf4829ceaceeb923e334065565969467e1113a4c1' 
  AND token = '8VBENlemaA1WZh46Zt0jWnZoeJHLW3t39qZo2i8nAgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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